Viscosities (η) and densities (ρ) of five binary mixtures of ethanenitrile with benzene and several substituted benzenes viz methylbenzene, 1,4-dimethylbenzene, chlorobenzene and 1,2-dichlorobenzene have been experimentally determined at 308.15 K. Viscosity deviations (∆η) from the linear blending rule have been evaluated for all the mixtures studied. These are small with a maximum negative deviation of about 6% for binary mixture with benzene and maximum positive deviation of about 3% for mixture with 1,4-dimethylbenzene. ∆η Values are fitted into RedlichKister equation and standard deviations in ∆η values, σ (∆η) have been evaluated. The correlating performance of several viscosity models such as Grunberg -Nissan, Katti and Chaudhari, Hind-McLaughlin -Ubbelohde and Sedgwick has been evaluated. Grunberg-Nissan viscosity model is suitable for viscosities of several binary systems studied. The results are discussed in terms of molecular interactions between the components of binary mixtures.

Viscosities, η, of five binary mixtures of 2-methylpropane nitrile with aromatic hydrocarbons, viz. benzene, methylbenzene, 1,4-dimethylbenzene, chlorobenzene and 1,2-dichlorobenzene, have been measured at temperatures 303.15 and 308.15 K. Deviations in viscosities, η, from the linear mixing rule have been determined for all of the binary mixtures studied at both experimental temperatures. The η values are negative for all the five systems at both experimental temperatures. Parameters of the Redlich-Kister and Myers and Scott equations have been fitted to the η values and standard deviations, σ ( η), have also been evaluated. The correlating performances of several viscosity models have been evaluated. The Hind-McLaughlin-Ubbelohde viscosity model gives fairly constant interaction parameters with composition. Results are discussed in terms of unlike molecular interactions between the components of the binary mixtures.